First, add the corn, potatoes, onion, garlic powder, salt, pepper, and chicken broth to your crockpot and stir them together to combine.
Cover and cook on High for about 4 hours, or on Low for 6 hours, until potatoes are nearly tender.
While cooking, whisk together the heavy cream and cornstarch in a small bowl until smooth, then pour that blend into the soup and stir to incorporate.
After adding the cream mixture, cook on High for about an hour more—or until potatoes are tender and the broth has thickened to your liking. Then stir in the reserved chopped bacon.
Ladle the chowder into bowls and top with extra bacon bits, chopped green onions, or shredded cheese as desired.